- Usage in publication:
-
- Ralston formation
- Modifications:
-
- First used
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
First published use of name in the Front Range of CO in the Southern Rocky Mountain region. Intent to name, source of geographic name, and type locality not stated. Thought to be of sedimentary origin. [Lithology not described; thickness not stated; age not stated.] Intruded by Boulder Creek granite-gneiss (first used). Geologic map [not mapped].
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
-
- Ralston Formation
- Modifications:
-
- Not used
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Invalid. Incidental mention without definition. Name preoccupied. Listed as a unit of east-central Front Range, CO in the Southern Rocky Mountain region, of the pre-1,700 m.y. (Precambrian X) metamorphic complex.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).